html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  background: #fff;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
}

main {
  display: grid;
  width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  place-items: center;
}

img {
  display: block;
  width: min(100%, 335px);
  height: auto;
  max-height: 100vh;
  max-height: 100dvh;
  object-fit: contain;
}